Source: Lecture Notes 3–4, Textbook pp. 222–223
Difficulty: Introductory to Intermediate. Prerequisites: Basic understanding of health psychology concepts from Weeks 1–3.
This topic covers the role of exercise and physical activity within health promotion, one of the core pillars of health psychology. It sits alongside diet, sleep, and accident prevention as a modifiable health behaviour. You should already be comfortable with basic concepts such as self-efficacy, health behaviour models, and the biopsychosocial approach from earlier weeks. The material draws on both the main lecture and a supplementary mini-lecture on exercise, weight loss, and barriers to physical activity across demographic groups.
Regular exercise improves both physical and mental health, reducing risks of cardiovascular disease, diabetes, and certain cancers while boosting mood, self-efficacy, and cognitive function. Getting people to exercise (and keep exercising) depends on individual factors like self-efficacy and social support, as well as environmental factors like safe, convenient settings. Significant disparities exist across gender, race, and socioeconomic status, and effective interventions must be tailored to address these barriers.
Aerobic exercise
Exercise characterised by high intensity, long duration, and the need for endurance. It is considered the most beneficial type of exercise for health outcomes.
Think of it as sustained, heart-pumping activity (running, cycling, swimming) rather than brief bursts like a single heavy lift.
Self-efficacy (for exercise)
A person's belief in their own ability to successfully start and maintain an exercise routine.
In simple terms, it is your confidence that you can stick with a workout plan, even when motivation dips.
Relapse prevention (exercise context)
Techniques designed to increase long-term adherence to exercise programmes by identifying situations where a person is likely to stop exercising.
Think of it as building a plan for the moments you are most tempted to skip the gym.
Social engineering (health promotion)
Policy-level or environmental changes designed to nudge populations toward healthier behaviour, such as reducing sugary drink sizes or requiring helmet laws.
In simple terms, it is changing the environment so the healthier choice becomes the easier or only choice.
NREM sleep / REM sleep
See the companion study notes on Sleep and Health for full definitions of these terms, which connect to exercise's role in improving sleep quality.
Implementation intentions
Specific if-then plans that link a situational cue to a goal-directed behaviour (e.g., "If it is 7 a.m., then I will go for a run").
In simple terms, it is deciding in advance exactly when and where you will exercise, so the decision is already made.
Weight control
Reduced risk of cardiovascular disease
Reduced risk of Type II diabetes and metabolic syndrome
Reduced risk of some cancers
Stronger bones and muscles
Decreased resting heart rate and blood pressure; increased heart strength and efficiency
Improved sleep
Increased HDL (good) cholesterol
Improved immune system functioning
Promotes the growth of new neurons in the brain (Pereira et al., 2007)
Increased happiness and well-being
Improves mood and general well-being
Improves sense of self-efficacy
Improves cognitive functioning and attention to important stimuli
Has economic benefits (fewer sick days, lower healthcare costs)
Exercise has been found to be equivalent to pharmaceutical drugs for treating depression
Leads to lower levels of depression and anxiety
Come from families that practise exercise
Hold positive attitudes toward physical activity
Have a strong sense of self-efficacy for exercising
Tend to be energetic, extraverted, and sociable
Perceive themselves as athletic
Have social support from friends
Enjoy their chosen form of exercise
Feel a sense of responsibility for their own health
Convenient and accessible settings
Less crowded facilities
Safe places to run or walk (e.g., own neighbourhood)
Improved environmental options (parks, paths, cycle lanes)
Social support and accountability (e.g., going with a friend)
Having a regular exercise programme in place
Effective exercise interventions share several principles:
Incorporate principles of self-control
Increase motivation
Increase and maintain physical activity levels
Promote personal values aligned with health
Promote general lifestyle changes, not just one behaviour (e.g., quit smoking and start exercising)
Must be tailored to the individual
Family-based interventions encourage all family members to become more active, ideally starting at a young age.
Relapse prevention techniques increase long-term adherence by identifying the specific situations in which a person is most likely to stop exercising, then planning around them.
Multi-behaviour interventions target several linked health habits at once (eating, exercise, social engagement), which works when those habits reinforce one another.
Move more, sit less
2–5 hours per week of vigorous aerobic exercise (more than 5 hours is also beneficial)
Muscle-strengthening activities (e.g., lifting weights) on 2 or more days per week
Exercise alone is a slow route to weight loss. A 220-pound man running 12.5 miles every week (burning roughly 1.2 megajoules per day) would take approximately 5 years to lose 33 lbs through exercise alone. This underscores why dietary change is usually combined with exercise for weight management.
Increased metabolic rate
Suppressed appetite
Increase in lean body mass, which burns more calories to maintain
Reduced mortality rates and longer lifespan
Lower rates of cancer, heart disease, and diabetes
A single session of exercise releases approximately 9,000 molecules in the body
Fewer female secondary-school students meet youth physical activity guidelines than boys (11.4% of girls vs. 24.8% of boys)
In adulthood, barriers continue: pregnancy-related exercise myths, motherhood demands
As women age, health problems are often cited as a barrier
Minority groups in the US consistently have lower physical activity levels
Minority women, African Americans, and Native Americans/First Nations people have the lowest levels
Low SES and low education are also predictors of low physical activity
What works for underserved populations? Exercise programmes that:
Provide childcare
Offer home-based alternatives
Are translated into multiple languages
Incorporate religious or community practices into the programme
Students often think walking counts as aerobic exercise. It does not, because it does not strain the body enough to produce the benefits associated with high-intensity, sustained activity.
Students sometimes assume exercise alone is an efficient weight-loss strategy. The lecture example shows it can take years to lose meaningful weight through exercise without dietary change.
Students may believe that exercise only benefits physical health. In fact, exercise has substantial psychological benefits, including effects on mood, self-efficacy, and cognitive functioning that are comparable to pharmaceutical treatment for depression.
Students sometimes overlook environmental and structural barriers to exercise (safety, access, childcare) and focus only on individual motivation.
⚠️ Know the difference between aerobic exercise and general physical activity. The exam may test whether a given activity qualifies as aerobic.
⚠️ Self-efficacy appears across multiple health topics (exercise, diet, cancer screening). Be able to define it and explain its role in each context.
⚠️ Understand why exercise alone is inefficient for weight loss and be prepared to cite the 220-lb runner example.
⚠️ Be ready to list characteristics of people who exercise and distinguish individual factors (self-efficacy, personality) from environmental factors (safe settings, social support).
⚠️ Disparities in physical activity by gender, race, and SES are commonly tested. Know specific statistics (11.4% of girls vs. 24.8% of boys meeting guidelines) and the features of effective programmes for underserved groups.
True or False: Walking is considered a form of aerobic exercise. False. Walking does not strain the body with sufficient intensity or duration to qualify.
Exercise has been found to be equivalent to __________ for treating depression. Pharmaceutical drugs.
True or False: A 220-pound man running 12.5 miles per week could lose 33 lbs in about one year through exercise alone. False. It would take approximately 5 years.
The percentage of female secondary-school students meeting physical activity guidelines is approximately __________. 11.4% (compared to 24.8% of boys).
True or False: Relapse prevention techniques in exercise focus on increasing workout intensity. False. They focus on identifying situations where people are likely to stop exercising.
Q: What distinguishes aerobic exercise from other forms of physical activity?
A: Aerobic exercise is marked by high intensity, long duration, and the need for endurance. Activities like walking do not strain the body enough to produce the health benefits associated with aerobic exercise.
Q: Name three psychological benefits of regular exercise.
A: Improved mood and general well-being, improved sense of self-efficacy, and improved cognitive functioning (including attention to important stimuli).
Q: Why is exercise alone an inefficient strategy for weight loss? Use the lecture example.
A: A 220-pound man running 12.5 miles per week would take approximately 5 years to lose 33 lbs through exercise alone. Exercise burns relatively few calories compared to the deficit needed for significant weight loss, which is why dietary change is typically combined with exercise.
Q: List four characteristics of effective exercise programmes for underserved or minority populations.
A: They provide childcare, offer home-based alternatives, are translated into multiple languages, and incorporate religious or community practices.
Q: What is a relapse prevention technique in the context of exercise, and why is it used?
A: Relapse prevention involves identifying the specific situations in which a person is most likely to stop exercising and then planning strategies to maintain the habit through those situations. It is used to increase long-term adherence to exercise programmes.
This connects to diet and nutrition because exercise interventions are often combined with dietary change for weight management and overall health promotion. It connects to sleep because regular exercise is one of the recommended strategies for improving sleep quality (see Table 4.3 in the textbook). It also links to accident prevention, since physical activity training is used as a strategy to reduce fall-related injuries in older adults.
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